Chrome: Save to Drive is a Chrome extension that allows you to save any image, HTML5 video, or audio directly to your Google Drive account with a simple right-click.

The process is pretty straightforward. When you come across a file you want to save to your Google Drive, right-click it, select "Save image to Google Drive," and it gets sent over right away. Unfortunately you can't pick a folder in your Drive to send it to, and images occasionally have preview problems, but as a quick way to save a file without sending it to your hard drive it works great.